This medication can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.
Avoid drinking alcohol. It may increase drowsiness and dizziness caused by guaifenesin and hydrocodone.
Tell your doctor if you regularly use other medicines that make you sleepy (such as other cold or allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by guaifenesin and hydrocodone.
Do not take other over-the-counter cough, cold, allergy, pain, or sleep medications without first asking your doctor or pharmacist. Guaifenesin is contained in many medicines available over the counter. If you take certain products together you may accidentally take too much guaifenesin. Read the label of any other medicine you are using to see if it contains guaifenesin.
